Large blue shift of the biexciton state in tellurium doped CdSe colloidal quantum dots

Assaf Avidan, Dan Oron

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

The exciton-exciton interaction energy of tellurium doped CdSe colloidal quantum dots is experimentally investigated. The dots exhibit a strong Coulomb repulsion between the two excitons, which results in a huge measured biexciton blue shift of up to 300 meV. Such a strong Coulomb repulsion implies a very narrow hole wave function localized around the defect, which is manifested by a large Stokes shift. Moreover, we show that the biexciton blue shift increases linearly with the Stokes shift. This result is highly relevant for the use of colloidal QDs as optical gain media, where a large biexciton blue shift is required to obtain gain in the single exciton regime.

Original languageEnglish
Pages (from-to)2384-2387
Number of pages4
JournalNano Letters
Volume8
Issue number8
DOIs
Publication statusPublished - Aug 2008

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Tellurium
tellurium
blue shift
Excitons
Semiconductor quantum dots
quantum dots
excitons
Optical gain
shift
Wave functions
wave functions
Defects
LDS 751
defects
interactions
energy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Large blue shift of the biexciton state in tellurium doped CdSe colloidal quantum dots. / Avidan, Assaf; Oron, Dan.

In: Nano Letters, Vol. 8, No. 8, 08.2008, p. 2384-2387.

Research output: Contribution to journalArticle

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